| Mercyless vs Reina | 34–26 | 56.67% |
| Mercyless vs King | 19–26 | 42.22% |
| Mercyless vs Kazuya | 23–22 | 51.11% |
| Mercyless vs Bryan | 15–25 | 37.50% |
| Mercyless vs Clive | 12–27 | 30.77% |
| Mercyless vs Jun | 16–12 | 57.14% |
| Mercyless vs Azucena | 7–19 | 26.92% |
| Mercyless vs Steve | 13–11 | 54.17% |
| Mercyless vs Hwoarang | 7–15 | 31.82% |
| Mercyless vs Victor | 9–13 | 40.91% |
| Mercyless vs Heihachi | 10–12 | 45.45% |
| Mercyless vs Asuka | 7–14 | 33.33% |
| Mercyless vs Law | 3–17 | 15.00% |
| Mercyless vs Nina | 6–13 | 31.58% |
| Mercyless vs Jin | 9–9 | 50.00% |
| Mercyless vs Eddy | 7–10 | 41.18% |
| Mercyless vs Lars | 6–10 | 37.50% |
| Mercyless vs Lidia | 11–5 | 68.75% |
| Mercyless vs Paul | 2–13 | 13.33% |
| Mercyless vs Leo | 8–7 | 53.33% |
| Mercyless vs Yoshimitsu | 10–4 | 71.43% |
| Mercyless vs Devil Jin | 5–9 | 35.71% |
| Mercyless vs Jack-8 | 6–7 | 46.15% |
| Mercyless vs Dragunov | 4–9 | 30.77% |
| Mercyless vs Lee | 3–10 | 23.08% |
| Mercyless vs Xiaoyu | 5–6 | 45.45% |
| Mercyless vs Lili | 8–2 | 80.00% |
| Mercyless vs Alisa | 3–6 | 33.33% |
| Mercyless vs Kuma | 2–6 | 25.00% |
| Mercyless vs Shaheen | 2–4 | 33.33% |
| Mercyless vs Leroy | 1–5 | 16.67% |
| Mercyless vs Raven | 1–4 | 20.00% |
| Mercyless vs Claudio | 2–2 | 50.00% |
| Mercyless vs Zafina | 1–3 | 25.00% |
| Mercyless vs Feng | 0–3 | 0.00% |
Limitations
This data is often requested to give insight into which characters you have more trouble with than others, but it is not particularly helpful for that. The main issue is that it is heavily skewed by how strong the opponents you play are.
For example, this data suggests my worst matchup is clearly vs Reina, but that's just because most of those games are vs Yagami.
There is a way to account for this being worked on. The central idea is to assign each matchup a rating vs you which adjusts based on the result, much like the regular rating but also based on the rating of each player. With this, it would give a better summary of how well you perform vs each character.
In the meantime, this page is here to present the data as requested.